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I believe this is the video, for reference: https://www.youtube.com/watch?v=-e1_QhJ1EhQ

In 0:30 you can see the bag changes (the wrinkles), could be just a reshoot, but makes the magic gone.

The bag snaps closed internally. I had to watch it at 25% speed over and over.

The cool thing about slowing it down is you can see its feet wobbling side-to-side at about 10X per second to keep its balance.